Electron-discharge device



July 19, 1927.

V. L. RONCI ELECTRON DISCHARGE DEVICE Filed April 27, 1923 Patented July 19, 1927.

UNITED STATES 1,636,015 PATENT, OFFICE.

VICTOR L. RONCI, O1 BROOKLYN, NEW YORK, ASSIGNOR TO WESTERN PANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION 01 ELECTRIC COM- NEW YORK.

ELECTRON-DISCHARGE DEVICE.

Application filed April 27, 1923. swarm). 034,915.

This invention relates to electron discharge devices and more especially to h gh power vacuum tubes and has for its ob ect an improved method of assembling metallic and non-metallic portions of the structure.

In one type of power tube, the cathode is strung over hooks carried by each of two blocks of insulating material. The shank of each hook passes through an aperture in one 1 of the insulating blocks and is held in position thereon by nuts screwed thereon at either side of the insulating block.

According to this invention, each block 'of insulating material is provided with a plurality of'pairs of apertures. The shank of each filament supporting hook passes through one aperture of each pair and 1s bent back to pass through the other aperture. The short portion of the supporting member is heated and headed over against the face of the block to prevent the withdrawal of the hook. This arrangement prevents the filament supporting hook from becoming loose in the insulating member due to the difference in expansion of the insulating material and the shank of the hook.

It eliminates entirely the use of nuts which cannot be sufficiently tightened to insure a permanent lock because of the frailness of the wire used for the hook and results in a considerable saving in the cost of production because of the elimination of all threads and nuts.

Referring now to the drawing, Fig. 1

discloses an electron discharge device constructed in accordance with the invention;

Fig. 2 discloses the method of joining together the filament supporting member and the insulating member; Fig. 3 discloses the finished product, and Fig. 4 is a sectional view on the line 4-4 of Fig. 3.

Referring now to Fig. 1, the electron dis charge device comprises an enclosing vessel composed of a glass portion 10, to which is sealed a metallic cup-shaped portion 11 which comprises the anode of the device.

Within the anode and supported from the glass portion in the usual manner is a grid electrode 12 and a cathode 13, the cathode being supported from hooks 14 mounted on a block of insulating material 15. To attach the filament supporting members to the insulating members, one end ofeach supporting member is first bent to form a short hook, and both ends are passed through apertures inthe insulating block as shown in Fig. 2, the short end projectin slightly beyond the surface of the insu ating block. The aperture throu h which the short end extends in prefera ly counter-sunk The electrodes 16 of a weldin brought into contact with t e hook and the short projectin rent passed therethrou h unti the wire melts to form a button 17 fitting in the countersunk portion. The hook is thus effectively prevented from moving in either direction and the connection between the filament sup- 'iorting hook and the insulating member remains tight despite the difierence in ex ansion between the insulating material and the hook, thereby avoiding the necessity of threading the ends of the hooks and roviding nuts therefor. After the connection has been made between the metallic member and the insulating member, the long end is bent machine are bend of the end and curto form a hook 18 from which the filament may be supported.

It is, of course, understood that although this invention has been disclosed in connection with a filament su for other uses within t pended claims.

What is claimed is:

1. In an electron discharge device, a metallic standard, an insulating member having a. pair of apertures carried thereby and a supporting member bent to provide two parallel portions, each of said portions lying in one of said apertures, a head on one of said portions engaging said insulating member whereby movement of the supporting e scope of the apmember relative to the insulating mem her is prevented, and an electrode supported by said member.

port, it is adapted 2. In an electron discharge device, a metallic standard, an insulating member having a pair of apertures carried thereby, a supporting member bent to provide two parallel portions of unequal length, each of said portions lying in one of said apertures, the shorter of said portions beih fused to form a button at the end thereof engaging said insulating member for preventing removal of said sup orting member from said insulating mem er, and an electrode carried by said supporting member. 5

3. In an electron discharge device a metallic standard, an insulating member sup-' whereby movement of said member relative orted thereby, said insulating member havto the insulating member is prevented, and mg a pair of apertures therethrough, a mean electrode supported by the longer end of 10 fallic member bent To provide two parallel said metallic member. 6 portions of unequal length each of said por In witness whereof, I hereunto subscribe tions lying in one of said apertures, 11 head my name this 25 day of Aprih A. D. 1923. on ihe shorter po'rlion engaging said member VICTOR L. RONCI. 

